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https://www.readbyqxmd.com/read/28548838/synthesis-of-defined-and-functionalized-glycans-of-lipoteichoic-acid-a-cell-surface-polysaccharide-from-clostridium-difficile
#1
Kang Yu, Ningning Bi, Chenghe Xiong, Shuihong Cai, Zhongzhu Long, Zhongwu Guo, Guofeng Gu
Two structurally defined, functionalized glycans of lipoteichoic acid (LTA, also known as PS-III) from C. difficile, which have one or two repeating units of LTA linked to the core trisaccharide, were efficiently synthesized via a convergent [2 + 3] or [2 + 2 + 3] strategy. The α-linkage of both N-acetylglucosamine residues in the repeating unit were constructed with glycosyl imidates of azidosugars as donors, while the phosphodiester bridges between the oligosaccharides were fashioned using H-phosphonate chemistry...
May 26, 2017: Organic Letters
https://www.readbyqxmd.com/read/28545561/sources-of-variability-in-the-measurement-of-ascaris-lumbricoides-infection-intensity-by-kato-katz-and-qpcr
#2
Alice V Easton, Rita G Oliveira, Martin Walker, Elise M O'Connell, Sammy M Njenga, Charles S Mwandawiro, Joanne P Webster, Thomas B Nutman, Roy M Anderson
BACKGROUND: Understanding and quantifying the sources and implications of error in the measurement of helminth egg intensity using Kato-Katz (KK) and the newly emerging "gold standard" quantitative polymerase chain reaction (qPCR) technique is necessary for the appropriate design of epidemiological studies, including impact assessments for deworming programs. METHODS: Repeated measurements of Ascaris lumbricoides infection intensity were made from samples collected in western Kenya using the qPCR and KK techniques...
May 25, 2017: Parasites & Vectors
https://www.readbyqxmd.com/read/28545248/ephedra-treated-donor-derived-gut-microbiota-transplantation-ameliorates-high-fat-diet-induced-obesity-in-rats
#3
Jing-Hua Wang, Bong-Soo Kim, Kyungsun Han, Hojun Kim
Changes in gut microbiota (GM) are closely associated with metabolic syndrome, obesity, type 2 diabetes and so on. Several medicinal herbs, including Ephedra sinica (Es), have anti-obesity effects that ameliorate metabolic disorders. Therefore, in this study we evaluated whether Es maintains its anti-obesity effect through Es-altered gut microbiota (EsM) transplantation. GM was isolated from cecal contents of Es treated and untreated rats following repeated transplants into obese rats via oral gavage over three weeks...
May 23, 2017: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/28544640/an-in%C3%A2-vitro-model-demonstrates-the-potential-of-neoplastic-human-germ-cells-to-influence-the-tumour-microenvironment
#4
B Klein, H-C Schuppe, M Bergmann, M P Hedger, B E Loveland, K L Loveland
Testicular germ cell tumours (TGCT) typically contain high numbers of infiltrating immune cells, yet the functional nature and consequences of interactions between GCNIS (germ cell neoplasia in situ) or seminoma cells and immune cells remain unknown. A co-culture model using the seminoma-derived TCam-2 cell line and peripheral blood mononuclear cells (PBMC, n = 7 healthy donors) was established to investigate how tumour and immune cells each contribute to the cytokine microenvironment associated with TGCT...
May 23, 2017: Andrology
https://www.readbyqxmd.com/read/28543744/repetitive-supra-physiological-shear-stress-impairs-red-blood-cell-deformability-and-induces-hemolysis
#5
Jarod T Horobin, Surendran Sabapathy, Michael J Simmonds
The supra-physiological shear stress that blood is exposed to while traversing mechanical circulatory assist devices affects the physical properties of red blood cells (RBCs), impairs RBC deformability, and may induce hemolysis. Previous studies exploring RBC damage following exposure to supra-physiological shear stress have employed durations exceeding clinical instrumentation, thus we explored changes in RBC deformability following exposure to shear stress below the reported "hemolytic threshold" using shear exposure durations per minute (i...
May 23, 2017: Artificial Organs
https://www.readbyqxmd.com/read/28543738/crispr-editing-in-biological-and-biomedical-investigation
#6
Xing-Da Ju, Jing Xu, Zhong Sheng Sun
The CRISPR (clustered regularly interspaced short palindromic repeat)-Cas (CRISPR--associated protein) system, a prokaryotic RNA-based adaptive immune system against viral infection, is emerging as a powerful genome editing tool in broad research areas. To further improve and expand its functionality, various CRISPR delivery strategies have been tested and optimized, and key CRISPR system components such as Cas protein have been engineered with different purposes. Benefiting from more in-depth understanding and further development of CRISPR, versatile CRISPR-based platforms for genome editing have been rapidly developed to advance investigations in biology and biomedicine...
May 20, 2017: Journal of Cellular Biochemistry
https://www.readbyqxmd.com/read/28543044/quantification-of-body-iron-and-iron-absorption-in-the-reds-ii-donor-iron-status-evaluation-rise-study
#7
Joseph E Kiss, Rebecca J Birch, Whitney R Steele, David J Wright, Ritchard G Cable
BACKGROUND: Repeated blood donation alters the iron balance of blood donors. We quantified these effects by analyzing changes in body iron as well as calculating iron absorbed per day for donors enrolled in a prospective study. STUDY DESIGN AND METHODS: For 1308 donors who completed a final study visit, we calculated total body iron at the enrollment and final visits and the change in total body iron over the course of the study. Taking into account iron lost from blood donations during the study and obligate losses, we also calculated the average amount of iron absorbed per day...
May 19, 2017: Transfusion
https://www.readbyqxmd.com/read/28543021/a-30-year-systematic-review-and-meta-analysis-of-hepatitis%C3%A2-b-virus-among-blood-donors-in-mainland-china-revealing-increase-of-new-threats
#8
Zhan Gao, Yu Zhang, Hua Shan, Ling Shi, Jing Liu, Min Xu, Peibin Zeng, Yu Liu, Miao He
BACKGROUND: Although screening strategies have been routinely implemented in blood centers, the residual risk of transfusion-transmitted hepatitis B virus (HBV) still poses a public health concern in China. The aim of this study is to investigate the HBV blood screening reactive rate and to illustrate the demographics of the corresponding blood donors with revealing of heterogeneity between previous studies and discovering potentially negligent threats. STUDY DESIGN AND METHODS: Literature reporting the HBV screening reactive rate in Chinese blood donors was identified by systematic searching of four electronic databases...
May 19, 2017: Transfusion
https://www.readbyqxmd.com/read/28538579/the-split-pectoralis-flap-combining-the-benefits-of-pectoralis-major-advancement-and-turnover-techniques-in-one-flap
#9
Rodger H Brown, Safa E Sharabi, Katarzyna E Kania, Larry H Hollier, Shayan A Izaddoost
BACKGROUND: The pectoralis major is a versatile flap used as an advancement or turnover flap for sternal wound treatment. The advancement flap provides suboptimal inferior sternal coverage and poorly fills mediastinal dead space. The turnover flap covers the inferior sternum and fills dead space but requires disinsertion of the muscle from the humerus, resulting in functional loss and cosmetic deformity. METHODS: The authors describe a new technique of splitting the pectoralis muscle along its fibers, using the superior portion as an advancement flap and the inferior portion as a turnover flap...
June 2017: Plastic and Reconstructive Surgery
https://www.readbyqxmd.com/read/28527117/non-viral-and-viral-delivery-systems-for-crispr-cas9-technology-in-the-biomedical-field
#10
REVIEW
Zhi-Yao He, Ke Men, Zhou Qin, Yang Yang, Ting Xu, Yu-Quan Wei
The clustered regularly interspaced short palindromic repeats (CRISPR)-associated protein 9 (CRISPR-Cas9) system provides a novel genome editing technology that can precisely target a genomic site to disrupt or repair a specific gene. Some CRISPR-Cas9 systems from different bacteria or artificial variants have been discovered or constructed by biologists, and Cas9 nucleases and single guide RNAs (sgRNA) are the major components of the CRISPR-Cas9 system. These Cas9 systems have been extensively applied for identifying therapeutic targets, identifying gene functions, generating animal models, and developing gene therapies...
May 2, 2017: Science China. Life Sciences
https://www.readbyqxmd.com/read/28526045/standardization-of-platelet-releasate-products-for-clinical-applications-in-cell-therapy-a-mathematical-approach
#11
Francesco Agostini, Jerry Polesel, Monica Battiston, Elisabetta Lombardi, Stefania Zanolin, Alessandro Da Ponte, Giuseppe Astori, Cristina Durante, Mario Mazzucato
BACKGROUND: Standardized animal-free components are required for manufacturing cell-based medicinal products. Human platelet concentrates are sources of growth factors for cell expansion but such products are characterized by undesired variability. Pooling together single-donor products improves consistency, but the minimal pool sample size was never determined. METHODS: Supernatant rich in growth factors (SRGF) derived from n = 44 single-donor platelet-apheresis was obtained by CaCl2 addition...
May 19, 2017: Journal of Translational Medicine
https://www.readbyqxmd.com/read/28524366/contrasting-hcv-and-hiv-seroepidemiology-in-11-years-of-blood-donors-screening-in-brazil
#12
J E Levi, S M Lira, C B Bub, M B Polite, C C Terzian, J M Kutner
BACKGROUND: Blood donors are, in principle, healthy individuals who may be revealed as infectious for blood-borne agents by the laboratory screening process, depicting the asymptomatic burden of the disease. Therefore, monitoring hepatitis C virus (HCV)-infected donor and human immunodeficiency virus (HIV)-infected donor and associating to their demographical and behavioural characteristics may shed light on the dynamics and contemporary changes in these viruses' epidemiology. METHODS: Donors presenting repeatedly reactive HCV or HIV serology/nucleic acid testing (NAT) screening results were submitted to confirmatory testing...
May 19, 2017: Transfusion Medicine
https://www.readbyqxmd.com/read/28522342/acute-and-repeated-exposure-with-the-nitric-oxide-no-donor-sodium-nitroprusside-snp-differentially-modulate-responses-in-a-rat-model-of-anxiety
#13
Martha A Orfanidou, Anastasios Lafioniatis, Aikaterini Trevlopoulou, Ntilara Touzlatzi, Nikolaos Pitsikas
The nitric oxide (NO) donor sodium nitroprusside (SNP) actually is under investigation for the treatment of schizophrenia. That anxiety disorders are noted to occur commonly in schizophrenia patients is known. Contradictory results were reported however, concerning the effects of SNP in animal models of anxiety disorders. The present study investigated the effects of acute and repeated administration of SNP on anxiety-like behaviour in rats assessed in the light/dark test. The effects of SNP on motility in a locomotor activity chamber were also investigated in rats...
May 15, 2017: Nitric Oxide: Biology and Chemistry
https://www.readbyqxmd.com/read/28515773/building-a-multipurpose-insertional-mutant-library-for-forward-and-reverse-genetics-in-chlamydomonas
#14
Xi Cheng, Gai Liu, Wenting Ke, Lijuan Zhao, Bo Lv, Xiaocui Ma, Nannan Xu, Xiaoling Xia, Xuan Deng, Chunlei Zheng, Kaiyao Huang
BACKGROUND: The unicellular green alga, Chlamydomonas reinhardtii, is a classic model for studying flagella and biofuel. However, precise gene editing, such as Clustered Regularly Interspaced Short Palindromic Repeats (CRISPR) and CRISPR-associated protein (Cas9) system, is not widely used in this organism. Screening of random insertional mutant libraries by polymerase chain reaction provides an alternate strategy to obtain null mutants of individual gene. But building, screening, and maintaining such a library was time-consuming and expensive...
2017: Plant Methods
https://www.readbyqxmd.com/read/28514060/improved-in-tube-electro-membrane-extraction-followed-by-high-performance-liquid-chromatography-for-simple-and-selective-determination-of-ionic-compounds-optimization-by-central-composite-design
#15
Mohammad Bazregar, Maryam Rajabi, Yadollah Yamini, Alireza Asghari
In this work, an efficient sample clean-up method named in-tube electro-membrane extraction is modified to resolve the formation of bubbles in the extraction process. This modified method is applied for the extraction of two model analytes including tartrazine and sunset yellow from food samples. The method is based upon the electro-kinetic migration of ionized compounds by the application of an electrical potential difference, and on this basis, the analytes under investigation, as anionic compounds, simply migrate from the donor phase, and are concentrated in the acceptor phase...
May 17, 2017: Journal of Separation Science
https://www.readbyqxmd.com/read/28509699/penis-transplantation-first-us-experience
#16
Curtis L Cetrulo, Kai Li, Harry M Salinas, Matthew D Treiser, Ilse Schol, Glen W Barrisford, Francis J McGovern, Adam S Feldman, Michael T Grant, Cigdem Tanrikut, Jeffrey H Lee, Richard J Ehrlichman, Paul W Holzer, Garry M Choy, Raymond W Liu, Zhi Yang Ng, Alexandre G Lellouch, Josef M Kurtz, William G Austen, Jonathan M Winograd, Branko Bojovic, Kyle R Eberlin, Ivy A Rosales, Robert B Colvin, Dicken S C Ko
OBJECTIVE: We describe the first successful penis transplant in the United States in a patient with a history of subtotal penectomy for penile cancer. BACKGROUND: Penis transplantation represents a new paradigm in restoring anatomic appearance, urine conduit, and sexual function after genitourinary tissue loss. To date, only 2 penis transplants have been performed worldwide. METHODS: After institutional review board approval, extensive medical, surgical, and radiological evaluations of the patient were performed...
May 15, 2017: Annals of Surgery
https://www.readbyqxmd.com/read/28505409/human-asthmatic-bronchial-cells-are-more-susceptible-to-sub-chronic-repeated-exposures-of-aerosolized-carbon-nanotubes-at-occupationally-relevant-doses-than-healthy-cells
#17
Savvina Chortarea, Hana Barosova, Martin James David Clift, Peter Wick, Alke Petri-Fink, Barbara Rothen-Rutishauser
Although acute pulmonary toxicity of carbon nanotubes (CNTs) has been extensively investigated, the knowledge of potential health effects following chronic occupational exposure is currently limited and based only upon in vivo approaches. Our aim was to realistically mimic sub-chronic inhalation of multi-walled CNTs (MWCNTs) in vitro, using the Air-Liquid Interface Cell Exposure system (ALICE) for aerosol exposures onto reconstituted human bronchial tissue from healthy and asthmatic donors. The reliability and sensitivity of the system was validated using crystalline quartz (DQ12), which elicited an increased (pro-)inflammatory response, as reported in vivo...
May 15, 2017: ACS Nano
https://www.readbyqxmd.com/read/28501802/stability-of-proteins-in-dried-blood-spot-biobanks
#18
Johan Björkesten, Stefan Enroth, Qiujin Shen, Lotta Wik, David Hougaard, Arieh Cohen, Lene Sörensen, Vilmantas Giedraitis, Martin Ingelsson, Anders Larsson, Masood Kamali-Moghaddam, Ulf Landegren
An important motivation for the construction of biobanks is to discover biomarkers that identify diseases at early, potentially curable stages. This will require biobanks from large numbers of individuals, preferably sampled repeatedly, where the samples are collected and stored under conditions that preserve potential biomarkers. Dried blood samples are attractive for biobanking because of the ease and low cost of collection and storage. Here we have investigated their suitability for protein measurements...
May 13, 2017: Molecular & Cellular Proteomics: MCP
https://www.readbyqxmd.com/read/28501173/an-exploiting-of-cost-effective-direct-current-conductivity-detector-in-gas-diffusion-flow-injection-system
#19
Wasin Somboot, Jaroon Jakmunee, Tinakorn Kanyanee
In this work, a homemade direct current (DC) conductivity detector as an alternative cost-effective detection device has been fabricated and investigated to use in flow analysis system. Under the selected appropriate conditions of flow system, the electrolysis of a carrier stream at the conductivity detector was negligible and provides well-defined signal. The cost-effective DC conductivity detector was demonstrated to couple with gas diffusion flow injection system for determination of dissolved inorganic carbon (DIC) in water...
August 1, 2017: Talanta
https://www.readbyqxmd.com/read/28494509/estimates-of-total-body-iron-indicate-19-mg-and-38-mg-oral-iron-are-equivalent-for-the-mitigation-of-iron-deficiency-in-individuals-experiencing-repeated-phlebotomy
#20
Walter Bialkowski, Joseph E Kiss, David J Wright, Ritchard Cable, Rebecca Birch, Pam D'Andrea, Barbara J Bryant, Bryan R Spencer, Alan E Mast
Iron deficiency anemia is a common clinical condition often treated with tablets containing 65 mg of elemental iron. Such doses can elicit gastrointestinal side effects lowering patient compliance. Oral iron supplements also increase hepcidin production causing decreased fractional absorption of subsequent doses. Frequent blood donors often become iron deficient. Therefore, they were enrolled in a two-year study involving continued blood donations and randomization to receive no pill, placebo, 19, or 38 mg ferrous gluconate for 60 days...
May 11, 2017: American Journal of Hematology
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